December 03, 2018
Rose
When lots of people in an area are vaccinated, fewer people get sick. Then fewer germs are around to spread from person to person. This concept is called herd immunity, or community immunity.
from WebMD Health https://ift.tt/2zI99G9
December 03, 2018
Rose
Healthy Living, WebMD Health
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from WebMD Health https://ift.tt/2zI99G9
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